#2708 BLOC Trial-3: Upgrade with backup failed with General Protection Exception

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#2708: Upgrade with backup failed with General Protection Exception
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 Reporter:  kimquirk             |       Owner:  wmb at firmworks.com
     Type:  defect               |      Status:  new              
 Priority:  blocker              |   Milestone:  Trial-3          
Component:  ofw - open firmware  |     Version:                   
 Keywords:                       |    Verified:  0                
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 I loaded my B2 unit with q2b87 and nand image 385 (which matches some of
 the returned units we've seen).

 I created 2 abiword docs, a paint image and a tamtam sound file and saved
 them.

 Then I used the autoreinstallation upgrade procedure with the setting to
 do the backup first.

 When I booted the machine with this USB stick (which has worked well in
 upgrading many other 5xx versions to 542):

 ...
 Type any key to interrupt automatic startup
 Boot device: /usb/disk:\boot\olpc.fth Arguments:
 <buffer at 800000>:320: clos-nand-ihs ?
 General Protection Exception

 I reset the .fth file to 'false' so it would NOT try to do the backup
 first; and the upgrade and activation worked just fine.

 [NOTE: My B2 had been running recent builds before downgrading it to
 Q2B87, and Mitch took a look for mfg data before I did this downgrade.
 There was no mfg data, so he thought this would be fine to proceed with
 this test.]

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Ticket URL: <https://dev.laptop.org/ticket/2708>
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